150801-N-OV434-318 NORFOLK, Va. (Aug. 1, 2015) Chief of Naval Operations (CNO) Adm. Jonathan Greenert addresses the crew during the commissioning ceremony of the Virginia-class attack submarine USS John Warner (SSN 785). John Warner is the U.S. Navy's 12th Virginia-class submarine. (U.S. Navy photo by Mass Communication Specialist 1st Class Daniel N. Garas)